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Red Hot Manifold

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Bob Pomykala

09-24-2002 18:14:51




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I am the proud owner of a Ford 900 row crop gasoline engine tractor. I have owned it for 20 years. The exhaust manifold will get so hot that it turns red. I have checked the timing, static and engine running. Also have recently rebuilt the engine. I may have the wrong carburator on it, but dont know how to tell. other than that, the tractor runs well. I use it on my vegetable farm as a spray tractor. Someone said that incorrect fuel mixture might do it. The plugs dont foul, and the exhaust is clean. Any ideas? Its driving me batty. Thanks, Bob

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Mark K.

09-26-2002 21:58:05




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
Hello,
My 4000SU did this also and would be red half way up the muffler. Found that my timing was retarded and the vacuum advance was frose up and port was also blocked. When I fixed that it even made that Hollie carb not spit on accelerating. Good luck.
Mark



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Waltert Mo

09-25-2002 08:43:32




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
Sam:
I had an engine do the same thing after I had adjusted the valve lifters too tight. After driving I raised the hood and the exhaust manifold was red hot!
Hope this helps.



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paul

09-25-2002 04:48:44




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
This would be normal for a heavy pull, like plowing or a big disk, etc.

But, not for pulling a sprayer?

--->Paul



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GWB111

09-25-2002 04:32:28




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
Check the centrifical advance in the distributor.



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Rubintropfen

09-27-2002 12:59:00




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 Re: Re: Red Hot Manifold in reply to GWB111, 09-25-2002 04:32:28  
I agree about the spark advance as a possibility. I started investigating a red-hot manifold on my 860 and wound up finding the centrifugal spark advance was stuck. Took it apart and cleaned it up and everything was OK.



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GWB111

09-25-2002 04:31:31




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
Check the centrifical advance in the distributor.



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Sam

09-24-2002 18:20:15




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 Re: Red Hot Manifold in reply to Bob Pomykala, 09-24-2002 18:14:51  
I used to have a 4000 that when I worked it hard it would do this. It doesn't sound like your working hard pulling a sprayer. Is the carb set too lean? Does the temp guage show hotter than usual?



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TimK

09-25-2002 11:39:38




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 Re: Re: Red Hot Manifold in reply to Sam, 09-24-2002 18:20:15  
For my $.02, if your plugs are chalky white, and not light brown, your burning too hot. I think it is either a too retarded spark setting (solution: increase the advance as long as you do go so far as to create a spark knock) or a too lean a fuel mixture (solution: drill out slightly the main jet). Neither one of these solutions will hurt anything if I'm wrong. Better fix it or you will burn up some exhaust valves.

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